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PostgreSQL is a community developed, open source, relational database, made available under a BSD-like license. The PostgreSQL documentation is expansive and incredibly useful.

PostgreSQL is the open source database started at UC-Berkeley back in 1986 as Postgres project. Today, PostgreSQL is an enterprise class RDBMS, one of the most powerful database engines available.

Strengths of PostgreSQL are high scalability and fault-tolerance. PostgreSQL is ACID compliant and conforms to the ANSI-SQL:2008 standard.

PostgreSQL includes the ability to use various programming languages including PERL, Python, R, and many others. It also allows several additional modules to add features and capabilities.

PostgreSQL is available under a liberal open source license. From the project website:

[The] license gives you the freedom to use, modify and distribute
PostgreSQL in any form you like, open or closed source. Any
modifications, enhancements, or changes you make are yours to do with
as you please.